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Arionoceras : ウィキペディア英語版
Arionoceras

''Arionoceras'' is an extinct orthocerid genus from the Middle and Upper Silurian, of Europe that is estimated to have lived from 422.9—418.1 mya, existing for approximately .〔(PaleoBiology Database: ''Arionoceras'', basic info )〕
==Taxonomy==
''Arionoceras'' was named by Barskov (1966) 〔; Some Remarks and Emendaation of the Family Arionoceratidae Dzik 1984 (Cephalopoda, Nautiloidea).()〕 and originally assigned to the Michelinoceratidae, but attributed by Serpagli and Gnoli (1977) -''ibid'' to the Geisonoceratidae Zhuravleva (1959) "on the basis of the (admittedly irregular) occurrence of a lining-like endosiphucular deposit." Dzik (1984) assigned ''Arionoceras'' to the newly proposed Arionoceratidae as the type genus. Sepkoski (2002)〔J. J. Sepkoski. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363:1-560〕 follows previous authors in putting ''Arionoceras'' in the Orthoceratida.

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